Hyperbolic D Knob

thingiverse

To replace a crock pot's broken knob, I designed a D-shaped fitting with a hemicylinder. At scale, the fitting's cylindrical diameter is 1/4 inch, and its void corresponds to a radius of 1/8 inch. The D may require inset for flush mounting. Print it with full fill to avoid breakage at the junction of inner and outer layers; you might need to trim the bottom flare if printed on a heated platform. A photo at 25% printing shows this issue.